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Can I read Rift-induced Disruption of Cratonic Keels Drives Kimberlite Volcanism on EtoBox?
Rift-induced Disruption of Cratonic Keels Drives Kimberlite Volcanism by Thomas M. Gernon; Stephen M. Jones; Sascha Brune; Thea K. Hincks; Martin R. Palmer; John C. Schumacher; Rebecca M. Primiceri; Matthew Field; William L. Griffin; Suzanne Y. O’Reilly; Derek Keir; Christopher J. Spencer; Andrew S. Merdith; Anne Glerum is a Physics and Astronomy article available to read on EtoBox.
What is Rift-induced Disruption of Cratonic Keels Drives Kimberlite Volcanism about?
Kimberlites are volatile-rich, occasionally diamond-bearing magmas that have erupted explosively at Earth’s surface in the geologic past^1–3^. These enigmatic magmas, originating from depths exceeding 150 km in Earth’s mantle^1^, occur in stable cratons and in pulses broadly synchronous with supercontinent cyclicity^4^. Whether their mobilization is driven by mantle plumes^5^ or by mechanical weakening of cratonic lithosphere^4,6^ remains unclear. Here we show that most kimberlites spanning the past billion years erupted about 30 million years (Myr) after continental breakup, suggesting an association with rifting processes. Our dynamical and analytical models show that physically steep lithosphere–asthenosphere boundaries (LABs) formed during rifting generate convective instabilities in the asthenosphere that slowly migrate many hundreds to thousands of kilometres inboard of rift zones. These instabilities endure many tens of millions of years after continental breakup and destabilize the basal tens of kilometres of the cratonic lithosphere, or keel. Displaced keel is replaced by a hot, upwelling mixture of asthenosphere and recycled volatile-rich keel in the return flow, causing
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It is typically read by researchers, students, and practitioners in Physics and Astronomy.
- Author
- Thomas M. Gernon; Stephen M. Jones; Sascha Brune; Thea K. Hincks; Martin R. Palmer; John C. Schumacher; Rebecca M. Primiceri; Matthew Field; William L. Griffin; Suzanne Y. O’Reilly; Derek Keir; Christopher J. Spencer; Andrew S. Merdith; Anne Glerum
- Publisher
- Nature Publishing Group UK
- Published
- 2023
- Language
- EN
- Field
- Physics and Astronomy (Physical Sciences)